Like most have said and I hate to beat a dead horse but USE whatever ester based oil like a redline motul rp product
The ester based synthetic oil is recommended to keep the vvl a little quieter from what I understand but again Im going off what I've heard.
I did notice a slight drop in temps when I switched over to redline a month after first owning my Z in may of 09
I haven't had any issues and I change mine every 5k, And you won't hurt anything if you change it out so soon as long you change the filter also.
I wouldn't be too worried about it if temps are a little higher since you need to keep in mind that you need to live in a stale environment
to truly asses this oil performance.
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